Graphite particles melting on a surface of cathode deposit in carbon arc

Details Graphite particles melting on a surface of cathode deposit in carbon arc Graphite particles melting on a surface of cathode deposit in carbon arc

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pobeo..74..171s&link_type=abstract

Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 74, p. 171 - 174 (2002). In: Invited lectures and

Physics

Plasma Flows, Graphite Particles

Scientific paper

From considering structure of a cathode deposit growing in a carbon arc at fullerene synthesis mode it was revealed that deposit is formed from 20-50 μm quasispherical particles arisen from coalescence of smaller particles in plasma flow. The smallest size of characteristic details of the deposit surface relief is about 2-3 nm. With use of obtained data on plasma parameters the velocity of 20 μm particles near the cathode was found to be higher than 50 m/s. The deposit formation mechanism based on physicochemical transformations taking place at collision of macroparticle with a cathode surface is proposed. It was shown that raising of temperature and pressure within the collision boundary layer amounts to 40K and 108 Pa respectively, that results in melting of graphite in the correspondence with a phase diagram of carbon.

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